A fluorine-containing ether compound of the present invention is represented by Formula (1).
R.sup.1CH.sub.2R.sup.2CH.sub.2R.sup.3(1) (In Formula (1), R.sup.1 is an organic end group having 3 or more carbon atoms which includes two or more polar groups with each polar group being bonded to different carbon atoms and the carbon atoms to which the polar groups are bonded being bonded to each other via a linking group including the carbon atoms which are not bonded to the polar groups, R.sup.2 includes a perfluoropolyether chain represented by Formula (3), and R.sup.3 is a hydroxyl group or R.sup.1)
(CF.sub.2).sub.y1O((CF.sub.2).sub.yO).sub.z(CF.sub.2).sub.y1(3) (In Formula (3), y represents an integer of 2 to 4, and z represents an integer of 1 to 30).

A fluorine-containing ether compound represented by a formula (1) shown below.

R.sup.4CH.sub.2R.sup.3CH.sub.2R.sup.2CH.sub.2R.sup.1CH.sub.2R.sup.2CH.sub.2R.sup.3CH.sub.2R.sup.5(1)

In formula (1), R.sup.1 and R.sup.3 represent the same or different perfluoropolyether chains, R.sup.2 represents a linking group containing at least one polar group, one or both of R.sup.4 and R.sup.5 represent a terminal group containing two or more polar groups, and R.sup.4 and R.sup.5 are different.

A camera module includes a lens module including a lens, and a base module configured to accommodate the lens module therein. A fluorinated lubricant is disposed on a portion of at least one of the lens module and the base module, the fluorinated lubricant includes a fluorescent material capable of emitting fluorescent light when illuminated with ultraviolet (UV) light.

The present invention relates to a magnetic recording medium in which a lubricant layer contains a compound A represented by general formula (1) and a compound B represented by general formula (2), satisfying (A/B)=0.2 to 3.0, and has an average thickness of 0.8 nm to 2 nm. R.sup.1C.sub.6H.sub.4OCH.sub.2CH(OH)CH.sub.2OCH.sub.2R.sup.2CH.sub.2OCH.sub.2CH(OH)CH.sub.2OH . . . (1) (R.sup.1 is an alkoxy group having 1 to 4 carbon atoms. R.sup.2 is CF.sub.2O(CF.sub.2CF.sub.2O).sub.x(CF.sub.2O).sub.yCF.sub.2 (x, y=0 to 15), CF.sub.2CF.sub.2O(CF.sub.2CF.sub.2CF.sub.2O).sub.zCF.sub.2CF.sub.2 (z=1 to 15), CF.sub.2CF.sub.2CF.sub.2O(CF.sub.2CF.sub.2CF.sub.2CF.sub.2O).sub.nCF.sub.2CF.sub.2CF.sub.2 (n=0 to 4). HOCH.sub.2CF.sub.2CF.sub.2O(CF.sub.2CF.sub.2CF.sub.2O).sub.mCF.sub.2CF.sub.2CH.sub.2OCH.sub.2CH(OH)CH.sub.2OH . . . (2) (m is an integer).

Provided herein is a lubricant comprising a compound of Formula I:

##STR00001##

wherein R.sub.1 and R.sub.2 are independent and have the structure selected from (CF.sub.2O).sub.x(CF.sub.2CF.sub.2O).sub.y(CF.sub.2CF.sub.2CF.sub.2O).sub.z(CF.sub.2CF.sub.2CF.sub.2CF.sub.2O).sub.w, x, y, z and w are selected from an integer from 0 to 30; p, and q are selected from an integer from 0 to 3; A and B are independent and have the structure selected from: (CH.sub.2CH(OH)CH.sub.2O).sub.jH, and j is an integer selected from 0 to 3.

A fullerene derivative of the present invention has a fullerene skeleton and a plurality of perfluoropolyether chains in a molecule, wherein the perfluoropolyether chains are bonded to the fullerene skeleton via methano groups, and a lubricant and fluororesin composition of the present invention contain the derivative.

The present invention relates to a fluorine-containing ether compound represented by Formula (1),

R.sup.1R.sup.2CH.sub.2R.sup.3CH.sub.2R.sup.4(1).

(In Formula (1), R.sup.1 is an end group including an organic group having at least one double bond or triple bond, R.sup.2 is a divalent linking group bonded to R.sup.1 by etheric oxygen, R.sup.3 is a perfluoropolyether chain, R.sup.4 is an end group having two or three polar groups with each polar group being bonded to different carbon atoms, and the carbon atoms, to which the polar groups are bonded, being bonded to each other via a linking group including carbon atoms to which the polar groups are not bonded.)

A fluorine-containing ether compound represented by a formula (1) shown below.
R.sup.1(O(CH.sub.2).sub.a).sub.b-[A]-[B]OCH.sub.2R.sup.2CH.sub.2R.sup.3(1)
(In the formula (1), R.sup.1 is an alkyl group which may have a substituent, or an organic group having at least one double bond or triple bond. Further, a represents an integer of 2 to 4, and b is 0 or 1. [A] is represented by a formula (2): (OCH.sub.2CH(OH)CH.sub.2).sub.c (wherein c is 1 or 2). [B] is represented by a formula (3): (O(CH.sub.2).sub.eCH(OH)CH.sub.2).sub.d (wherein d is 0 or 1, and e represents an integer of 2 to 4). However, the sum of c in the formula (2) and d in the formula (3) is 2. R.sup.2 is a perfluoropolyether chain. R.sup.3 is represented by a formula (4): (OCH.sub.2CH(OH)CH.sub.2).sub.2OCH.sub.2(CH.sub.2).sub.fOH (wherein f represents an integer of 2 to 5).

Disclosed is a fluoropolyether compound comprising a C.sub.4-10 aliphatic hydrocarbon chain present in the middle of the fluoropolyether compound and at least two perfluoropolyethers.

An object of the present invention is to provide a compound that is resistant to decomposition even when coming into contact with a magnetic head, while enabling a reduced spacing between the magnetic head and a magnetic disk, and to provide a lubricant comprising the compound, and a magnetic disk comprising the compound. The present invention relates to a compound represented by formula (1), a lubricant comprising the compound, and a magnetic disk comprising the compound:
C.sub.6H.sub.6-i[O(CH.sub.2).sub.nOCH.sub.2RCH.sub.2X].sub.i(1)
wherein n is an integer of 2 to 6; i is an integer of 2 or 3; X is a group represented by OH, O(CH.sub.2).sub.mOH, OCH.sub.2CH(OH)CH.sub.2OH, OCH.sub.2CH(OH)CH.sub.2OC.sub.6H.sub.5, or OCH.sub.2CH(OH)CH.sub.2OC.sub.6H.sub.4OCH.sub.3; m is an integer of 1 to 6; R is (CF.sub.2).sub.pO(CF.sub.2O).sub.x(CF.sub.2CF.sub.2O).sub.y(CF.sub.2CF.sub.2CF.sub.2O).sub.z(CF.sub.2CF.sub.2CF.sub.2CF.sub.2O).sub.w(CF.sub.2).sub.p; x and y are each a real number of 0 to 30; z is a real number of 0 to 30; w is a real number of 0 to 20; and p is an integer of 1 to 3.